Abstract: Speeding up of parallel computation is to be achieved.

Abstract: A parallel computer system includes: direct links that forms a direct connection between a sending node and a receiving node, one-hop links that forms a connection between a sending node and a receiving node by way of a return node that is other than the sending node and the receiving node, and a communication control unit that, when transferring data from a sending node to a receiving node, selects the link that connects the sending node and the receiving node from among a link that uses only a direct link, a link that uses only a one-hop link, and a link that forms a connection combines and uses the direct link and the one-hop link.

Abstract: An optical transceiver according to an exemplary aspect of the invention includes an interferometer including an input-side optical coupler, an output-side optical coupler, and two arms through which to propagate light and disposed between the input-side optical coupler and the output-side optical coupler, adding a bias phase difference of approximately ?/2+2n?, n representing an integer, between light beams propagating through the two arms; an optical phase modulator generating an optical signal obtained by modulating a phase of continuous wave light to be inputted depending on an electrical signal to be inputted; and an optical delay device making a difference in time for which the optical signal modulated by the optical phase modulator reaching the output-side optical coupler, wherein the optical phase modulator operates by changing carrier density in a silicon optical waveguide.

Abstract: A network system comprises a plurality of nodes and a plurality of optical amplifiers. A first node comprises a first transmitter configured to send a wavelength-division-multiplexed optical signal and a first receiver configured to receive a wavelength-division-multiplexed optical signal, and the second node comprises a second transmitter configured to send a wavelength-division-multiplexed optical signal and a second receiver configured to receive a wavelength-division-multiplexed optical signal. The first and second transmitters are optically connected to an input of the first optical amplifier and an input of the second optical amplifier, respectively, and the first and second receivers are optically connected to an output of the first optical amplifier and an output of the second optical amplifier, respectively. The receivers each comprise a photoreceiver and a reception circuit. The photoreceiver is electrically connected, by flip chip connection, to a reception circuit.

Abstract: A parallel computer system includes: direct links that forms a direct connection between a sending node and a receiving node, one-hop links that forms a connection between a sending node and a receiving node by way of a return node that is other than the sending node and the receiving node, and a communication control unit that, when transferring data from a sending node to a receiving node, selects the link that connects the sending node and the receiving node from among a link that uses only a direct link, a link that uses only a one-hop link, and a link that forms a connection combines and uses the direct link and the one-hop link.

Abstract: In an embodiment, a network system comprises a plurality of nodes and a plurality of optical amplifiers. A first node comprises a first transmitter configured to send a wavelength-division-multiplexed optical signal and a first receiver configured to receive a wavelength-division-multiplexed optical signal, and the second node comprises a second transmitter configured to send a wavelength-division-multiplexed optical signal and a second receiver configured to receive a wavelength-division-multiplexed optical signal. The first transmitter and the second transmitter are optically connected to an input of the first optical amplifier and an input of the second optical amplifier, respectively, and the first receiver and the second receiver are optically connected to an output of the first optical amplifier and an output of the second optical amplifier, respectively. Each of the first photoreceiver and the second photoreceiver comprises a photoreceiver and a reception circuit.

Abstract: At least two light-emitting elements emit light to a branching device, and the branching device divides the light that entered into an input port into at least two and emits the light from M number of output ports. An optical modulator individually modulates the M number of light beams that were emitted. When a first light-emitting element driven normally fails, the first light-emitting element is stopped and a second light-emitting element that was stopped is driven, thereby maintaining the emission of the modulated M number of light beams.

Abstract: An opto-electric integrated circuit includes an optical waveguide formed using a portion of an insulation layer on a silicon substrate to form a lower clad and using a portion of a semiconductor layer formed on the insulation layer to form a core. The opto-electric integrated circuit also includes an optical device connected to the optical waveguide, an electrical circuit connected to the optical device, a mesa-shaped connection section interconnecting the optical device and the electrical circuit, and an electrically conductive film formed in a region at least containing a flank surface of the connection section. The electrically conductive film is grounded while contacting the silicon substrate.

Abstract: An opto-electric integrated circuit includes an optical waveguide formed using a portion of an insulation layer on a silicon substrate to form a lower clad and using a portion of a semiconductor layer formed on the insulation layer to form a core. The opto-electric integrated circuit also includes an optical device connected to the optical waveguide, an electrical circuit connected to the optical device, a mesa-shaped connection section interconnecting the optical device and the electrical circuit, and an electrically conductive film formed in a region at least containing a flank surface of the connection section. The electrically conductive film is grounded while contacting the silicon substrate.

Abstract: An optical transceiver according to an exemplary aspect of the invention includes an interferometer including an input-side optical coupler, an output-side optical coupler, and two arms through which to propagate light and disposed between the input-side optical coupler and the output-side optical coupler, adding a bias phase difference of approximately ?/2+2n?, n representing an integer, between light beams propagating through the two arms; an optical phase modulator generating an optical signal obtained by modulating a phase of continuous wave light to be inputted depending on an electrical signal to be inputted; and an optical delay device making a difference in time for which the optical signal modulated by the optical phase modulator reaching the output-side optical coupler, wherein the optical phase modulator operates by changing carrier density in a silicon optical waveguide.

Abstract: At least two light-emitting elements emit light to a branching device, and the branching device divides the light that entered into an input port into at least two and emits the light from M number of output ports. An optical modulator individually modulates the M number of light beams that were emitted. When a first light-emitting element driven normally fails, the first light-emitting element is stopped and a second light-emitting element that was stopped is driven, thereby maintaining the emission of the modulated M number of light beams.

Abstract: A wavelength path communication node apparatus includes a wavelength path demultiplexer (321) which demultiplexes branched optical signals input to wavelength multiplexing ports into wavelength path signals, and outputs the wavelength path signals from wavelength demultiplexing ports corresponding to the respective wavelengths, a wavelength path multiplexer (322) which outputs wavelength path signals input to wavelength demultiplexing ports from wavelength multiplexing ports corresponding to the wavelengths of the wavelength path signals, a plurality of transponders (331) each of which converts a wavelength path signal input to a wavelength path transmission port into a client transmission signal to transmit the client transmission signal, and converts a received client reception signal into a wavelength path signal of a wavelength to output the wavelength path signal from a wavelength path reception port, a demultiplexing system optical matrix switch (323) which switches and connects the wavelength demultipl

Abstract: A light control element includes three or more silicon thin-film layers (522, 524, 526) placed on a first dielectric layer (521), second dielectric layers (523, 525) placed between the three or more silicon thin-film layers (522, 524, 526), and a third dielectric layer (529) placed to surround the silicon thin-film layers and the second dielectric layers. The three or more silicon thin-film layers are arranged to partially overlap with one anther. In the part where the silicon thin-film layers overlap, the second dielectric layers are placed between the silicon thin-film layers. In the three or more silicon thin-film layers, the silicon thin-film layers adjacent to each other have different conductivity types.

Abstract: A wavelength routing system includes a plurality of nodes (1, 2, 3, 4) and an array waveguide grating (40) having a routing property and optically connected to the plurality of nodes. Each of the nodes has a plurality of light sources (TLS) outputting lights at different wavelengths to the array waveguide grating, respectively, and a wavelength demultiplexer (125, 225, 325, 425) having a periodic property, demultiplexing a light output from the array waveguide grating, and outputting demultiplexed lights. The wavelength demultiplexer is set a channel period which is different from that of the array waveguide, and which is more than or equal to a number of output ports of the wavelength demultiplexer.

Abstract: A wavelength path communication node apparatus includes a wavelength path demultiplexer (321) which demultiplexes branched optical signals input to wavelength multiplexing ports into wavelength path signals, and outputs the wavelength path signals from wavelength demultiplexing ports corresponding to the respective wavelengths, a wavelength path multiplexer (322) which outputs wavelength path signals input to wavelength demultiplexing ports from wavelength multiplexing ports corresponding to the wavelengths of the wavelength path signals, a plurality of transponders (331) each of which converts a wavelength path signal input to a wavelength path transmission port into a client transmission signal to transmit the client transmission signal, and converts a received client reception signal into a wavelength path signal of a wavelength to output the wavelength path signal from a wavelength path reception port, a demultiplexing system optical matrix switch (323) which switches and connects the wavelength demultipl

Abstract: A light control element includes three or more silicon thin-film layers (522, 524, 526) placed on a first dielectric layer (521), second dielectric layers (523, 52) placed between the three or more silicon thin-film layers (522, 524, 526), and a third dielectric layer (529) placed to surround the silicon thin-film layers and the second dielectric layers. The three or more silicon thin-film layers are arranged to partially overlap with one anther. In the part where the silicon thin-film layers overlap, the second dielectric layers are placed between the silicon thin-film layers. In the three or more silicon thin-film layers, the silicon thin-film layers adjacent to each other have different conductivity types.

Abstract: A wavelength routing system includes a plurality of nodes (1, 2, 3, 4) and an array waveguide grating (40) having a routing property and optically connected to the plurality of nodes. Each of the nodes has a plurality of light sources (TLS) outputting lights at different wavelengths to the array waveguide grating, respectively, and a wavelength demultiplexer (125, 225, 325, 425) having a periodic property, demultiplexing a light output from the array waveguide grating, and outputting demultiplexed lights. The wavelength demultiplexer is set a channel period which is different from that of the array waveguide, and which is more than or equal to a number of output ports of the wavelength demultiplexer.

Abstract: One or more one-dimensional array-shaped photoelectric conversion modules 302 are mounted on a board 301. A one-dimensional array-shaped light receiving/emitting element 303 is mounted in each of the one-dimensional array-shaped photoelectric conversion modules 302. Further, the one-dimensional array-shaped photoelectric conversion modules 302 are mechanically and optically connected to a flexible fiber sheet 306 through an optical connector 305. As parallel transmission paths 306 from the one-dimensional array-shaped photoelectric conversion modules 302 approach an end of a board 301, they are laminated with each other and connected to a two-dimensional array-shaped optical connector 307 at an end of the board. Further, a wavelength multiplexer/demultiplexer is connected to the optical connector.

Abstract: A fiber-type optical coupler has two optical fibers including a core on which a slanting Bragg diffraction grating is formed and a first cladding and a second cladding bordered with a boundary plane close to the core. The two optical fibers are placed by approximating the boundary plane almost contacting the core, making respective optical axes almost parallel and also making slanting directions of the respective Bragg diffraction gratings almost parallel. A wave vector of the slanting Bragg diffraction grating is located in a plane made by a normal set up on the boundary plane almost contacting the core and the optical axis of the core, and an angle_made by the wave vector and the optical axis is 0 degree <_<90 degrees. In addition, a refractive index of the second cladding is lower than that of the first cladding.

Abstract: The present invention relates to a device and a method for monitoring each of the propagated light beams that are propagated in each waveguide of an arrayed waveguide device and a method of fabricating the device. In the prior art, problems were encountered in deriving monitor light and photodetecting the derived monitor light within the waveguide substrate. In the present invention, waveguide directional couplers are formed in the spaces between the arrayed waveguides to derive a portion of the propagated light as monitor light. Cavities are provided at the ends of auxiliary waveguides connected to the directional couplers, and monitor light is guideded into these cavities. The monitor light, after being reflected upward or downward of the substrate by optical path conversion elements installed inside the cavities, is photodetected by photodiodes. The optical path conversion elements can be fabricated by inserting metal bumps into the cavities and then forming the bumps with a mold.